Norris elmore clark



N. E. CLARK. CORNER BEAD CONSTRUCTION. APPLICATION FILED MAR. 3. 19 9.

1,308,889. Patentd July 8, 1919.

V INVENTOR 557m" (7m? expensive in this troplating constructions.

UNITED STATES PATENT OFFICE.

NORRIS ELMORE CLARK, 0F PLAINVILLE, CONNECTICUT; ASSIGNOR TO ROBERT S.ALLYN, TRUSTEE, OF NEW YORK, N. Y;

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Application filed March 3, 1919. Serial No. 280,412.

To all whom it may concern Be it known that I, NORRIS ELMORE CLARK, acitizen of the United States of America, residing at Plainville,Connecticut, have invented a new and nseful Corner-Bead Construction, ofwhich the following is a specification. v

In the past the problem of rotecting corner bead from corrosion has ieen a serious one. Hot galvanizing requires a lar e amount ofzinc orspelter and is not 0 y respectbut tends to warp the bead and requires arefinishing. Elecor cold galvanizing is also expensive and not entirelysatis actory. metal of thebead being relatively thin is liable to beweakened by the action of the acid of the plating solution. Sherardizingis also expensive when properly done and the metal is liable to beinjured in the operation. Furthermore experience has shown thatsherardizing of such a product on a commercial scale is unsatisfactoryand ineflicient. If the bead is made from previously plated stock theplating is quite likely to flake off or crack when forming the bent edgenot permanent and is not approved for such I have discovered anexceedingly simple and inexpensive and permanent method of protection bymeans of a pure zine strip or ribbon secured along the nose of-the head.This is preferably aplied to the body strip before bending the eadand-is stretched smoothly over the nose as the nose is formed. Thisprovides a perfectly smooth outer edge or nose which ives an attractivefinish to that part of the ead which is exposed. I preferably use agalvanized stock for making the body of the bead and in this way theexposed portion has a double protection of the original galvanizing andthe zinc strip or ribbon. The steel or iron strip for forming the beadshould be heavy enough to furnish all of the necessary strength of thehead for instance, #24 to #26 U. S. tandard gage. The protective stripneed only be sufliciently wide to cover the exposed edge or nose andmade very thin--say 6 inch.

Figure 1 is a side view of one form of bead embodying my inventionshowing one .ing another The in the usual way. Paint 15' to 8thousandths of. an

method of securing the protecting strip in place.

Fig. 2 is an end view of the same.

' Fig. 3 is a fragmentary view showing the protecting strip applied tothe body of the bead but before folding it.

Fig. 4 is another fragmentary view shoW- method of securing theprotecting strip to the body of the bead.

The body of the bead has the nose portion 5, and the two sides or wings6 -6 whlch flare outwardly and are adapted to be secured to the cornerpost. The sides Patented July 8, 1919.

are preferably provided with some form of opening for the plaster andmay be ribbed and flanged as shown in Figs. 1 and 2. This particularform of bead is claimed in .my application "#13555 filed March 11th,1915, from which this application has been di- -vided.-

The protecting strip or ribbon 7 is secured to the nose portion ofthebead, for instance, by tucking portions such as 8 through openings suchas 9 'in the sides preferably before folding the act of folding, theprotecting strip .is stretched tight and snug.

Preferably the sides of the bead immediately back of the nose arebrought together or nearly together as at 10 so as to form channels 11and shoulders or edges 12. The protecting strip is also preferably incontact with these portions of the bead, and at 13 adjacent the edges 12the strip may be:

knurled or otherwise roughened so as to increase the bonding effect ofthe plaster. This may be desirable where the protecting strip has aparticularly smooth surface or high finish. ing strip is more fullydescribed and claimed ilnlmy Patent No. 1,142,494, dated June 8,

In the construction. shown in Fi 4, the protecting strip 7' is securedto t e main body strip in a somewhat different manner. In this case themain body has perforations such as 9' and tangs 8' are partially outfrom the edges of the protecting strip 7' inserted through the openings9 and bent over on the back before the bead is folded. Mechanism forattaching the protecting strip in this manner is shown in my Patent No.1,142,493 dated This method of securing the protect-.

the bead so that by June 8, 1915. This patent also shows other methodsof securing the protecting strip to the body of the bead.

My Patents Nos. 1,129,454, issued F ebruary 23, 1915, and 1,142,494,show mecha nism for forming dilferent forms of corner bead.

The special advantages of the invention claimed herein are the provisionof a head, the exposed part of which when in use is smooth andabsolutely non-corrosive, and yet, the bead can be made cheaply, infact, it is possible to utilize ordinar plain or ungalvanized stripstock since al of the bead except the nose is embedded in the plaster orcement when in use.

' I claim:

1. A corner bead comprising a self-supporting body member having a noseand side portions and a protecting strip of a uniformly thinnon-corrosive metal secured in close intimate contact throughout withthe nose portion of the body member to protect the nose of the bead fromcorrosion when the remainder of the head is embedded in plaster.

2. A corner bead comprising a self-s'upporting body member having a noseand side portions with openings adjacent the junction of the nose andside portions and a relatively thln non-corrosive metal strip 1ntrmatelyembracing and in contact through out with the nose portion, and havingportions of said strip clenched in said openings for securing the partstogether.

8. A corner bead comprising a body member formed of a self-supportingstrip of metal and having a nose with relatively abrupt shoulders at theedges thereof and wing portions with side channels between the edges ofthe nose and the wing portions in combination with a relatively thinnoncorrosive protecting strip secured in intimate contact with the noseportion and the Walls of the side channels adjacent thereto.

4. A corner bead comprising a self-supporting body member having a noseand side portions and a relatively thin and smooth protecting stripsecured in intimate contact throughout with the nose portion and havingroughened sides adjacent the edges thereof.

5. A corner bead comprising a body memher having a relatively broad noseand sides brought together to form channels adjacent the edges of thenose and with openings at intervals along the edges of said channels,and a relatively thin protecting strip extending around the nose and inthe bottom of said channels and in intimate contact therewith and havingits edges secured in said openings.

NORRIS ELMORE CLARK.

